Granted Patent
Utility
US 5,118,420 · App. 07/656,373
Self-cleaning vacuum filter, particularly for filtering industrial lubricants and coolants
Inventor:
Alfonso Galletti
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Feb 19, 1991
Inventor
Alfonso Galletti
Assignee (at issue)
GI.PI. S.r.l.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.